I went through all of this and I highly suggest just losing the AR OC. Really. It blocks precious radiator area and isn't big enough to do what our cars need. It's also not fully exposed. The ER solution has ducting specifically designed for it for maximum air flow and you get all of your radiator back.

No more hijacking your aero thread. Apologies.

Haha no worries; this is the exact stuff I like to discuss.

I do agree the ER is ideal; just trying to see what I can do before shelling out the ca$h for it. In my opinion the area blocking the radiator is not large enough/blocking enough to make it noticeable. Air still flows through it just fine; and at speed that is a lot of cold air.